<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>菜鸟教程(runoob.com)</title>
    <style>
        /* 演示了如何增加或减少字符之间的空间。 */
        h1 {
            letter-spacing: 2px;
        }

        h2 {
            letter-spacing: -3px;
        }
    </style>
</head>

<body>
    <h1>This is heading 1</h1>
    <h2>This is heading 2</h2>
</body>

</html>